CN107852246B - Digital signal processing device and optical transceiver - Google Patents
Digital signal processing device and optical transceiver Download PDFInfo
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- CN107852246B CN107852246B CN201680041874.9A CN201680041874A CN107852246B CN 107852246 B CN107852246 B CN 107852246B CN 201680041874 A CN201680041874 A CN 201680041874A CN 107852246 B CN107852246 B CN 107852246B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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Abstract
The signal processing units (6a, 6b) can selectively switch between modulation/demodulation of a low-efficiency modulation scheme and modulation/demodulation of a high-efficiency modulation scheme, and perform digital signal processing. The parallel side interface of the input/output interface unit (A, B) is electrically connected to the signal processing unit (6 a). The serial side interface of the input/output interface unit (B) is electrically connected to the serial side interface of the input/output interface unit (D). A selection unit (7) connects the parallel side interface of the input/output interface unit (C) to the signal processing unit (6b) when the low-efficiency modulation scheme is selected, and connects the parallel side interface of the input/output interface unit (C) to the parallel side interface of the input/output interface unit (D) when the high-efficiency modulation scheme is selected.
Description
Technical Field
The invention relates to a digital signal processing device and an optical transceiver, which can selectively utilize optical transmission application without changing the structure and the connection mode, and reduce the number of ports of a frame processing part connected with a digital signal processing part.
Background
The coherent optical transmission technique refers to a technique of: like homodyne detection (homodyne detection) or heterodyne detection (heterodyne detection) in wireless communication, a receiver has a local light source, converts a beat signal (beat signal) generated by interference between local light output from the local light source and received signal light into a baseband or an intermediate frequency band, and recognizes and reproduces a received equalized waveform. According to the coherent optical transmission technology, it is possible to improve reception sensitivity, compensate for fixed dispersion in an optical fiber or the like (delay equalization), and the like. However, synchronization of the frequency and phase of the received signal light and the local light, polarization tracking (polarization トラッキング), and the like become problems.
In order to solve the above problem, a digital coherent optical transmission technique has been developed as a transmission technique for realizing a transmission capacity exceeding 100Gbit/s per 1 wavelength (see, for example, non-patent document 1). In the digital coherent optical transmission technology, optical phase synchronization is performed by digital signal processing, and adaptive compensation (adaptive equalization) is performed on delay characteristics due to polarization mode dispersion and wavelength dispersion of an optical fiber, thereby solving the problems of the conventional coherent optical transmission technology.
In the digital coherent optical transmission technology, the above-mentioned electrical signal processing employs digital signal processing, so that flexible signal processing can be realized. That is, in addition to the above-described optical phase synchronization and adaptive equalization, various kinds of processing such as error correction processing can be performed at once. Further, the appropriateness of adopting a certain process can be switched as necessary. For example, a technique has been developed in which any one modulation scheme is selected from among different types of modulation schemes according to an instruction from the outside and applied.
Next, a description will be given of a configuration and an operation of a conventional optical transceiver that can select either one of a Quadrature Phase Shift Keying (QPSK) of 100Gbit/s and a Quadrature Amplitude Modulation (QAM) of 200Gbit/s for transmission or reception.
Fig. 11 is a diagram showing a conventional optical transceiver capable of arbitrarily selecting a modulation scheme. The optical transceiver has: an optical transmission unit that outputs signal light modulated by any one of QPSK and 16QAM multilevel modulation schemes; a light receiving section that receives signal light that has been multi-valued modulated in any one of QPSK and 16QAM, and outputs an analog electrical signal as a received signal; a digital signal processing LSI; a framer LSI for reconstructing a transmitted or received frame and converting a frame format; and a frame transfer processing LSI.
The optical transmission unit receives an electrical modulated signal from the digital signal processing LSI, and outputs signal light modulated by any one of QPSK and QAM multilevel modulation. The light transmission unit includes: a semiconductor Laser (LD) that outputs a laser beam as a carrier wave; a multi-value modulator which multi-value modulates the laser beam output from the LD; and a driver that drives the multivalued modulator. In the QPSK modulation scheme of 100Gbit/s, an optical transmission unit multiplexes 25Gbit/s input signals of 4 channels (lane) in a 4-bit phase multiplexing (× 2) and polarization multiplexing (× 2) pair, thereby realizing a transmission rate of 100Gbit/s per 1 wavelength. In the 16QAM modulation scheme of 200Gbit/s, the optical transmission unit multiplexes 25Gbit/s input signals of 8 channels in 16-bit multiplexing (x 4) and polarization multiplexing (x 2) to realize a transmission rate of 200Gbit/s per 1 wavelength.
The light receiving section receives the multivalued modulated signal light and outputs an analog electrical signal as a reception signal. The light receiving section has a local light source (LO), a 90-degree optical hybrid circuit, and a balanced light receiving element (PD) array. In the case of the QPSK modulation system, signals of 4 channels in total (IQ signals of 2 pairs) are output from the balanced PD array, and in the case of the 16QAM modulation system, signals of 8 channels in total (IQ signals of 4 pairs) are output from the balanced PD array.
The optical transmitter and the optical receiver may be integrally mounted as an optical transceiver (transmitter). For example, a pluggable (pluggable) system such as CFP2-ACO can be used as the optical transceiver.
The digital signal processing LSI converts an analog reception signal into a digital signal, and demodulates the reception signal by digital signal processing. In addition, signals to be transmitted are encoded into modulation signals corresponding to various modulation schemes (QPSK or 16 QAM).
The configuration and operation of the digital signal processing LSI will be described in detail. The analog reception signal output from the light receiving unit is converted into a digital signal by an analog/digital (AD) converter. The digital signal output from the AD converter is subjected to a compensation of fixed chromatic dispersion, i.e., wavelength dispersion, of an optical fiber as a transmission path by a wavelength dispersion compensator, a waveform equalization by an adaptive equalizer, and a recognition and reproduction by a demodulator, wherein the adaptive equalizer is mainly subjected to an adaptive compensation of rapid waveform degradation caused by a polarization variation (skew variation) of a signal light transmitted through the optical fiber.
These processes are performed by digital signal processing, but since it is difficult to perform serial processing on a signal output from the optical receiving unit at a high speed of 25 Gbit/s/channel, the AD conversion unit usually performs digital signal processing after converting the signal into a parallel signal of about several hundreds of Mbit/s/channel. The received signal recognized and reproduced is converted into a 25 Gbit/s/channel serial signal by a parallel/serial conversion unit of the input/output interface unit, and then output to the framer LSI as a 100Gbit/s (25Gbit/s/× 4 channel) electrical signal.
On the other hand, a signal to be transmitted (hereinafter referred to as a transmission signal) output from the framer LSI is converted into a parallel signal suitable for digital signal processing by a serial/parallel conversion unit of the input/output interface unit, and then encoded by a modulation unit. The encoded transmission signal is converted into an analog modulation signal of 25 Gbit/s/channel for driving a multi-value modulator by a digital/analog (DA) converter, and is output to an optical transmitter.
The chromatic dispersion compensation unit, the adaptive equalization unit, the demodulation unit, and the modulation unit are referred to as a signal processing unit. The signal processing unit may have a functional unit for performing processing other than the above-described processing, such as error correction processing.
The digital signal processing LSI has 2 pairs of input/output interface units A, B corresponding to 2 pairs of 100Gbit/s transmission signals. When an optical transceiver transmits or receives 200Gbit/s signal light modulated by a 16QAM system, 2 pairs of 100Gbit/s transmission signals (for example, OTU4 and the like) are input to a signal processing unit and multiplexed.
In addition, there is also a system in which the function of processing by the framer LSI is incorporated in the digital signal processing LSI as one function of the signal processing unit. In this case, the input/output interface units in fig. 11 are directly connected to the frame transfer processing LSI, respectively.
Next, the configuration and operation of an optical transceiver that uses a digital signal processing LSI incorporating two modulation schemes, QPSK and 16QAM, shown in fig. 11, and that is applicable to both applications, 100Gbit/s × 2 wavelength transmission and 200Gbit/s × 1 wavelength transmission, will be described with reference to fig. 12 and 13.
Fig. 12 is a diagram showing a conventional optical transceiver that transmits or receives signal light of a bit rate of 100Gbit/s by the QPSK modulation scheme in each of two optical transceivers. By using signal light of different wavelengths in the optical transceivers 1a and 1b, it is possible to transmit signal light of 100Gbit/s × 2 wavelength of 200Gbit/s by wavelength multiplexing.
The optical transceivers 1a and 1b and the digital signal processing LSIs 2a and 2b in fig. 12 have the same configurations as the optical transceiver and the digital signal processing LSI shown in fig. 11, respectively. The frame processing unit 3 is composed of a framer LSI and a frame transfer processing LSI, and has at least three ports P1 to P3 through which signals can be exchanged with the input/output interface unit included in the digital signal processing LSI2a, 2 b. The input/output interface A, B of the digital signal processing LSI2a and the input/output interface C of the digital signal processing LSI2b are electrically wired to the ports P1 to P3 of the frame processing unit 3, respectively. In this example, the i/o interface section and the ports P1 to P3 of the frame processor 3 are connected by 4 channels for transmission and reception.
The optical transceiver 1a transmits or receives 100Gbit/s signal light modulated by the QPSK modulation scheme. Since the digital signal processing LSI2a processes only 100Gbit/s signals, it suffices that only one of the input/output interface units a of the two interfaces operates as an interface with the frame processing unit 3. Therefore, the input/output interface section B is used for 200Gbit/s × 1 wavelength transmission, which will be described later, and therefore is electrically wired to the port P2 of the frame processing section 3, but does not perform signal interaction in 100Gbit/s × 2 wavelength transmission. Similarly, the optical transceiver 1b transmits or receives 100Gbit/s signal light modulated by the QPSK modulation scheme. The digital signal processing LSI2b processes a 100Gbit/s signal transmitted or received by the optical transceiver 1b, and performs signal interaction with the port P3 of the frame processing unit 3 via the input/output interface unit C. The input/output interface unit D does not need to operate.
Fig. 13 is a diagram showing a conventional optical transceiver that transmits or receives signal light having a bit rate of 200Gbit/s by a 16QAM modulation scheme by one optical transceiver. The configuration and connection of the optical transceiver are the same as those of fig. 12 except that there are not two optical transceivers but one. However, since the optical transceiver 1a transmits or receives a 200Gbit/s signal modulated by the 16QAM modulation method, both the input/output interface units A, B of the digital signal processing LSI2a need to operate. The input/output interface unit A, B of the digital signal processing LSI2a and the ports P1 and P2 of the frame processing unit 3 perform signal interaction, respectively. On the other hand, the digital signal processing LSI2b does not need to operate. The input/output interface C of the digital signal processing LSI2b is electrically wired to the port P3 of the frame processor 3, but does not perform signal interaction.
The two applications of "100 Gbit/s × 2 wavelength transmission" based on the QPSK modulation scheme and "200 Gbit/s × 1 wavelength transmission" based on the 16QAM modulation scheme have a trade-off relationship (tradeoff). The 16QAM modulation scheme has a larger data amount (number of bits) that can be transmitted and received in 1 symbol (symbol) than the QPSK modulation scheme, but has a shorter transmission distance than the QPSK modulation scheme. That is, in "200 Gbit/s × 1 wavelength transmission", 200Gbit/s signal optical transmission is possible with one optical transceiver, but the transmission distance is short. On the other hand, in "100 Gbit/s × 2 wavelength transmission", although the transmission distance is long, two optical transceivers and optical wavelength resources are required. The optical transceiver shown in fig. 12 and 13 can be selectively applied to either "100 Gbit/s × 2 wavelength transmission" based on the QPSK modulation scheme or "200 Gbit/s × 1 wavelength transmission" based on the 16QAM modulation scheme, in consideration of the characteristics (loss, wavelength dispersion, etc.) of the optical fiber as a transmission medium, available wavelength resources, equipment cost, and the like.
Prior art documents
Patent document
Non-patent document 1: dynasty regia, zuoyangming show, Jitianyingdi, Zaoyshou and 'ultra-large capacity デジタルコヒーレント optical YUN delivering technique', NTT technique ジャーナル, Vol.23, P.13-18 (3 months in 2011)
Disclosure of Invention
Problems to be solved by the invention
The optical transceiver of fig. 12 and 13 has the following advantages: both optical transmission applications (which are both bit rates totaling 200 Gbit/s) can be selectively used for 100Gbit/s × 2 wavelength transmission and 200Gbit/s × 1 wavelength transmission without changing their structure and connection. On the other hand, there are problems as follows: the digital signal processing LSIs 2a and 2b included in the optical transceiver must be wired to the ports P1 to P3 of the frame processing unit 3 at all times, and therefore occupy the number of ports (3 ports) of the frame processing unit 3 that is larger than the number (2 ports) of actually performing signal interaction. Of course, if an optical transmission apparatus from which wiring to the port P2 has been removed is prepared for 100Gbit/s × 2 wavelength transmission and an optical transmission apparatus from which wiring to the port P3 has been removed is prepared for 200Gbit/s × 1 wavelength transmission, it is possible to occupy only the same number of ports of the frame processing units 3 as the number of ports that actually perform signal interaction, regardless of the optical transmission apparatus. However, it is necessary to design and develop an optical transmission device separately for optical transmission applications, and it is difficult to reduce the cost of the optical transceiver by mass production.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a digital signal processing apparatus and an optical transceiver capable of reducing the number of ports of a frame processing unit connected to a digital signal processing unit by selectively using an optical transmission application without changing a configuration or a connection method.
Means for solving the problems
The digital signal processing apparatus of the present invention is characterized by comprising: a 1 st digital signal processing unit having a 1 st signal processing unit, a 1 st input/output interface unit, and a 2 nd input/output interface unit; and a 2 nd digital signal processing unit having a 2 nd signal processing unit, a 3 rd input/output interface unit, a 4 th input/output interface unit, and a selection unit, wherein the 1 st signal processing unit and the 2 nd signal processing unit can selectively switch between modulation/demodulation of a low-efficiency modulation scheme and modulation/demodulation of a high-efficiency modulation scheme capable of transmitting or receiving signal light at a bit rate multiple of the low-efficiency modulation scheme to perform digital signal processing, the 1 st input/output interface unit, the 2 nd input/output interface unit, the 3 rd input/output interface unit, and the 4 th input/output interface unit mutually convert a serial signal and a parallel signal, parallel side interfaces of the 1 st input/output interface unit and the 2 nd input/output interface unit are electrically connected to the 1 st signal processing unit, and a serial side interface of the 2 nd input/output interface unit is electrically connected to a serial side interface of the 4 th input/output interface unit, the selection unit electrically connects the parallel side interface of the 3 rd input/output interface unit and the 2 nd signal processing unit when the low-efficiency modulation scheme is selected, and electrically connects the parallel side interface of the 3 rd input/output interface unit and the parallel side interface of the 4 th input/output interface unit when the high-efficiency modulation scheme is selected.
An optical transceiver of the present invention is characterized by comprising: a frame processing unit having a 1 st port and a 2 nd port; a 1 st digital signal processing unit and a 2 nd digital signal processing unit which perform digital signal processing by inputting a signal from the frame processing unit or which output a signal subjected to digital signal processing to the frame processing unit; and a 1 st optical transceiver and a 2 nd optical transceiver which receive signal light, convert the signal light into an electrical signal, and output the electrical signal to the 1 st digital signal processing unit and the 2 nd digital signal processing unit, respectively, or convert the electrical signal input from the 1 st digital signal processing unit and the 2 nd digital signal processing unit into signal light and transmit the signal light, wherein the 1 st digital signal processing unit has a 1 st signal processing unit, a 1 st input/output interface unit, and a 2 nd input/output interface unit, the 2 nd digital signal processing unit has a 2 nd signal processing unit, a 3 rd input/output interface unit, a 4 th input/output interface unit, and a selection unit, and the 1 st signal processing unit and the 2 nd signal processing unit can selectively switch between modulation/demodulation of a low-efficiency modulation method and modulation/demodulation of a high-efficiency modulation method capable of transmitting or receiving signal light at a bit rate which is a multiple of the low-efficiency modulation method, and perform digital signal processing, wherein the 1 st input/output interface section, the 2 nd input/output interface section, the 3 rd input/output interface section and the 4 th input/output interface section mutually convert a serial signal and a parallel signal, the parallel side interfaces of the 1 st input/output interface section and the 2 nd input/output interface section are electrically connected to the 1 st signal processing section, the serial side interfaces of the 1 st input/output interface section and the 3 rd input/output interface section are electrically connected to the 1 st port and the 2 nd port of the frame processing section, respectively, the serial side interface of the 2 nd input/output interface section is electrically connected to the serial side interface of the 4 th input/output interface section, and the selecting section electrically connects the parallel side interface of the 3 rd input/output interface section and the 2 nd signal processing section when the low-efficiency modulation scheme is selected, and electrically connecting the parallel side interface of the 3 rd input/output interface unit and the parallel side interface of the 4 th input/output interface unit.
Effects of the invention
According to the present invention, it is possible to reduce the number of ports of a frame processing unit connected to a digital signal processing unit by selectively using an optical transmission application without changing the configuration and connection method.
Drawings
Fig. 1 is a diagram showing an optical transceiver according to embodiment 1 of the present invention.
Fig. 2 is a diagram showing an optical transceiver according to embodiment 1 of the present invention.
Fig. 3 is a diagram showing an example of mounting an optical transceiver according to embodiment 1 of the present invention.
Fig. 4 is a diagram showing an example of mounting an optical transceiver according to embodiment 1 of the present invention.
Fig. 5 is a diagram showing an example of mounting of an optical transceiver according to embodiment 1 of the present invention.
Fig. 6 is a diagram showing an optical transceiver according to embodiment 2 of the present invention.
Fig. 7 is a diagram showing an optical transceiver according to embodiment 2 of the present invention.
Fig. 8 is a diagram showing an optical transceiver according to embodiment 3 of the present invention.
Fig. 9 is a diagram showing an optical transceiver according to embodiment 4 of the present invention.
Fig. 10 is a diagram showing an optical transceiver according to embodiment 4 of the present invention.
Fig. 11 is a diagram showing a conventional optical transceiver capable of arbitrarily selecting a modulation scheme.
Fig. 12 is a diagram showing an optical transceiver that transmits or receives signal light of a bit rate of 100Gbit/s by a QPSK modulation scheme in two optical transceivers according to the related art.
Fig. 13 is a diagram showing an optical transceiver that transmits or receives signal light having a bit rate of 200Gbit/s by a 16QAM modulation scheme in the related art.
Detailed Description
Hereinafter, a digital signal processing device and an optical transceiver according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components may be denoted by the same reference numerals, and redundant description thereof may be omitted.
Embodiment mode 1
Fig. 1 and 2 are diagrams showing an optical transceiver according to embodiment 1 of the present invention. The optical transceivers 1a, 1b transmit or receive signal light. The optical transceivers 1a and 1b each have: an optical transmission unit that outputs signal light modulated by any one of QPSK and 16QAM multilevel modulation schemes; and a light receiving section that receives the signal light multi-valued modulated in any one of QPSK and 16QAM, and outputs an analog electrical signal as a reception signal. The optical transmitter and the optical receiver of fig. 1 and 2 have the same configuration as the optical transmitter and the optical receiver shown in fig. 11.
The digital signal processing LSIs 2a and 2b input signals from the frame processing unit 3 and perform digital signal processing, or output signals subjected to digital signal processing to the frame processing unit 3. The optical transceivers 1a and 1b receive signal light, convert the signal light into an electrical signal, and output the electrical signal to the digital signal processing LSIs 2a and 2b, respectively, or convert the electrical signal input from the digital signal processing LSIs 2a and 2b into signal light, and transmit the signal light.
The frame processing unit 3 includes a framer LSI for reconstructing a transmitted or received frame and converting a frame format, and a frame transfer processing LSI. The frame processing unit 3 receives the signal from the digital signal processing LSIs 2a and 2b and performs frame processing, or outputs the signal subjected to frame processing to the digital signal processing LSIs 2a and 2 b.
The digital signal processing LSI2a includes an analog/digital (AD) converter 4a, a digital/analog (DA) converter 5a, a signal processor 6a, and an input/output interface unit A, B. The digital signal processing LSI2b includes an AD converter 4b, a DA converter 5b, a signal processor 6b, an input/output interface unit C, D, and a selector 7. The input/output interface units a to D respectively include serial/parallel converters for converting serial signals into parallel signals, and parallel/serial converters for converting parallel signals into serial signals.
The signal processing units 6a and 6b can selectively switch between modulation and demodulation of a low-efficiency modulation scheme and modulation and demodulation of a high-efficiency modulation scheme capable of transmitting or receiving signal light at a bit rate multiple times the low-efficiency modulation scheme, and perform digital signal processing. In the present embodiment, the low-efficiency modulation scheme is a QPSK modulation scheme, and the high-efficiency modulation scheme is a 16QAM modulation scheme capable of transmitting or receiving signal light at a bit rate 2 times that of the low-efficiency modulation scheme. The signal processing units 6a and 6b in fig. 1 and 2 have the same configuration as the signal processing unit shown in fig. 11.
The modulation schemes applicable to the present invention are not limited to QPSK and 16QAM, but the digital signal processing LSIs 2a, 2b can selectively switch between and apply two different modulation schemes, and the bit rate of signal light transmitted or received in one medium differs by a factor of 2 between the two modulation schemes. For example, in the present embodiment, signal light of any modulation scheme is modulated at a symbol rate of 25Gbit/s, and a bit rate of 100Gbit/s is set for QPSK and a bit rate of 200Gbit/s is set for 16 QAM.
The AD converters 4a and 4b convert 25 Gbit/s/channel analog reception signals output from the light-receiving sections of the optical transceivers 1a and 1b into digital signals, respectively. The signal processing units 6a and 6b perform wavelength dispersion compensation and adaptive equalization on the digital signals output from the AD conversion units 4a and 4b, respectively, by digital signal processing, and then perform recognition and reproduction. The parallel/serial conversion unit of the input/output interface units a to D converts the recognized and reproduced reception signal into a 25 Gbit/s/channel serial signal, and outputs the signal to the frame processing unit 3 as an electric signal of 100Gbit/s (25Gbit/s/× 4 channels).
The serial/parallel conversion unit of the input/output interface units a to D converts a signal to be transmitted (hereinafter referred to as a transmission signal) output from the frame processing unit 3 into a parallel signal suitable for digital signal processing. The signal processing units 6a and 6b encode the parallel signals into modulation signals corresponding to a desired modulation scheme (QPSK or 16 QAM). The DA converters 5a and 5b convert the encoded transmission signal into an analog modulation signal of 25 Gbit/s/channel and output the analog modulation signal to the optical transceivers 1a and 1 b.
The input/output interface units a to D perform signal interaction with both the signal processing units 6a and 6b and the frame processing unit 3, and convert serial signals and parallel signals into each other. Therefore, the interfaces of the input/output interface units a to D with the signal processing units 6a and 6b are referred to as "parallel side interfaces", and the interfaces with the frame processing unit 3 are referred to as "serial side interfaces".
The parallel side interface of (the serial/parallel converter and the parallel/serial converter of) the input/output interface section A, B of the digital signal processing LSI2a is directly electrically connected to the signal processing section 6 a. The serial side interface of (the serial/parallel converter and the parallel/serial converter of) the input/output interface section a of the digital signal processing LSI2a is electrically connected to the port P1 of the frame processing section 3. The serial side interface of the input/output interface unit B of the digital signal processing LSI2a is electrically connected to the serial side interface of the input/output interface unit D of the digital signal processing LSI2B (specifically, the serial side interface of the serial/parallel converter of the input/output interface unit B is electrically connected to the serial side interface of the parallel/serial converter of the input/output interface unit D, and the serial side interface of the parallel/serial converter of the input/output interface unit B is electrically connected to the serial side interface of the serial/parallel converter of the input/output interface unit D). The serial-side interface (each of the serial-to-parallel converter and the parallel-to-serial converter) of the input/output interface section C of the digital signal processing LSI2b is electrically connected to the port P2 of the frame processing section 3.
In the digital signal processing LSI2b, the selection unit 7 electrically connects the parallel side interface of the input/output interface unit C to the signal processing unit 6b when the low-efficiency modulation scheme is selected, and electrically connects the parallel side interface of the input/output interface unit C to the parallel side interface of the input/output interface unit D when the high-efficiency modulation scheme is selected. Specifically, when the low-efficiency modulation scheme is selected, the selection unit 7 electrically connects the parallel-side interface of each of the serial/parallel converter and the parallel/serial converter of the input/output interface unit C to the signal processing unit 6b, and when the high-efficiency modulation scheme is selected, electrically connects the parallel-side interface of the serial/parallel converter of the input/output interface unit C to the parallel-side interface of the parallel/serial converter of the input/output interface unit D, and electrically connects the parallel-side interface of the parallel/serial converter of the input/output interface unit C to the parallel-side interface of the serial/parallel converter of the input/output interface unit D.
Next, with reference to fig. 1, the operation of the optical transceiver when the QPSK modulation scheme is selected by the digital signal processing LSIs 6a and 6b, and the opposing optical transceivers are connected to each other via two media to transmit or receive signal light having a bit rate of 100Gbit/s × 2 wavelength will be described.
When the QPSK modulation scheme is selected, the selector 7 provided in the digital signal processing LSI2b electrically connects the parallel side interface of the input/output interface unit C and the signal processor 6 b. The QPSK modulated signal light transmitted or received by the optical transceiver 1a is subjected to digital signal processing in the signal processing unit 6a in the digital signal processing LSI2a, and then is subjected to signal interaction with the port P1 of the frame processing unit 3 via the input/output interface unit a. At this time, the input/output interface section B of the digital signal processing LSI2a does not operate. Similarly, the QPSK modulated signal light transmitted or received by the optical transceiver 1b is subjected to digital signal processing in the signal processing unit 6b in the digital signal processing LSI2b, and is then transmitted to the port P2 of the frame processing unit 3 via the selection unit 7 and the input/output interface unit C. At this time, the input/output interface unit D of the digital signal processing LSI2b does not operate. The operation of the optical transceiver is the same as that of the conventional optical transceiver shown in fig. 12 and 13.
Next, with reference to fig. 2, the operation of the optical transceiver when the 16QAM modulation scheme is selected by the digital signal processing LSI2a, and the opposing optical transceivers are connected to each other via one medium, and signal light with a bit rate of 200Gbit/s is transmitted or received at one wavelength will be described.
When the 16QAM modulation scheme is selected, the selector 7 provided in the digital signal processing LSI2b electrically connects the parallel side interface of the input/output interface unit C and the parallel side interface of the input/output interface unit D. One 100Gbit/s received signal of the 16QAM modulated signal light transmitted or received by the optical transceiver 1a is subjected to digital signal processing by the signal processing unit 6a in the digital signal processing LSI2a, and then subjected to signal interaction with the port P1 of the frame processing unit 3 via the input/output interface unit a. The other 100Gbit/s reception signal is subjected to digital signal processing by the signal processing unit 6a in the digital signal processing LSI2a, and is then sent to the input/output interface unit B. Since the serial interface of the input/output interface B of the digital signal processing LSI2a and the serial interface of the input/output interface D of the digital signal processing LSI2B are electrically connected in advance, a signal input/output through the input/output interface B of the digital LSI2a is transmitted to the port P2 of the frame processing unit 3 via the input/output interface D, the selector 7, and the input/output interface C of the digital signal processing LSI 2B.
As described above, the optical transceiver according to the present embodiment includes the selector 7, and the selector 7 electrically connects the serial interface of the input/output interface B of the digital signal processing LSI2a and the serial interface of the input/output interface D of the digital signal processing LSI2B by wiring, and electrically connects the parallel interface of the input/output interface C of the digital signal processing LSI2B and either the signal processor 6B or the parallel interface of the input/output interface D according to the selected modulation scheme. Thus, the digital signal processing LSIs 2a, 2b and the frame processing section 3 can be connected through the minimum number of 2 ports. Therefore, the number of ports of the frame processing section connected to the digital signal processing section can be reduced to the minimum necessary limit by selectively using the optical transmission application without changing the configuration and the connection method. As a result, a low-cost optical transceiver can be provided.
The selector 7 of the present embodiment can be realized by an FET transistor or the like provided inside the digital signal processing LSI2 b. When a control signal (not shown) for selecting a modulation scheme is input from the outside of the optical transceiver, the control signal may be introduced into the digital signal processing LSIs 2a, 2b to change the modulation scheme to a desired scheme, and the selection unit 7 may switch the connection to the modulation scheme. "connection corresponding to the modulation scheme" means that the selector 7 electrically connects the parallel side interface of the input/output interface unit C of the digital signal processing LSI2b and the parallel side interface of the input/output interface unit D when a higher speed modulation scheme (16QAM or the like) is selected, and that the selector 7 electrically connects the parallel side interface of the input/output interface unit C of the digital signal processing LSI2b and the signal processing unit 6b when a lower speed modulation scheme (QPSK or the like) is selected.
Fig. 3 to 5 are diagrams showing examples of mounting of an optical transceiver according to embodiment 1 of the present invention. The serial interface of the input/output interface unit B of the digital signal processing LSI2a and the serial interface of the input/output interface unit D of the digital signal processing LSI2B may be electrically connected by fixed wiring. When two digital signal processing LSIs 2a, 2b are mounted on one LSI package 8, they may be electrically connected to the outside of the LSI package 8 by wiring on a substrate on which the LSI package 8 is mounted, as shown in fig. 3. Alternatively, as shown in fig. 4, the LSI package 8 may be electrically connected to each other through a wiring. The present invention is not limited by the manner of mounting the wiring.
There may be a need to apply fec (forwarderror correction)9 between the selector 7 and the input/output interface B as shown in fig. 5 in order to correct errors occurring at the time of serial communication and serial/parallel conversion between the input/output interface B of the digital signal processing LSI2a and the input/output interface D of the digital signal processing LSI2B, and the present invention can be applied to this case as well. The present invention is not limited to the presence or absence of an FEC function unit in each path in a light transmission device.
The signal processing units 6a and 6b may have a functional unit that performs processing other than the above-described processing, such as error correction processing. The signal processing units 6a and 6b may be provided with a function of processing by a framer LSI. In this case, the digital signal processing LSIs 2a, 2b are directly connected to the frame transfer processing LSIs, respectively.
Embodiment mode 2
In embodiment 1, an optical transceiver having two digital signal processing LSIs 2a, 2b is described, the two digital signal processing LSIs 2a, 2b have signal processing units 6a, 6b, respectively, and the signal processing units 6a, 6b can switch between modulation and demodulation in a low-efficiency modulation scheme (QPSK or the like) and modulation and demodulation in a high-efficiency modulation scheme (16QAM or the like) capable of transmitting or receiving signal light at a bit rate 2 times that of the low-efficiency modulation scheme. However, the present invention is not limited to the structure of embodiment 1. In the present embodiment, the high-efficiency modulation scheme (64QAM, etc.) can transmit or receive signal light at a bit rate 4 times that of the low-efficiency modulation scheme (QPSK, etc.), and the optical transceiver has four digital signal processing LSIs.
Fig. 6 and 7 are diagrams showing an optical transceiver according to embodiment 2 of the present invention. The optical transceivers 1a to 1d, the digital signal processing LSIs 2a to 2d, and the frame processing section 3 according to the present embodiment are substantially the same in configuration as the optical transceivers 1a and 1b, the digital signal processing LSIs 2a and 2b, and the frame processing section 3 according to embodiment 1, respectively, but differ in the following points. The optical transceivers 1a to 1d include: an optical transmission unit that outputs signal light modulated by any one of QPSK (e.g., 100Gbit/s) and 64QAM (e.g., 400 Gbit/s); and an optical transmission unit that receives the signal light modulated by any one of QPSK and 64QAM multilevel modulation schemes and outputs an analog reception signal. The digital signal processing LSIs 2a to 2d each have four input/output interface units, and can output signals multiplexed at a bit rate of 400Gbit/s as 4-channel signals at the same 100 Gbit/s. The selection units 7a to 7c are provided in the digital signal processing LSIs 2b to 2d, respectively. The serial-side interfaces of the input/output interface unit A, E, I, M of the digital signal processing LSIs 2 a-2 d are electrically connected to the ports P1-P4 of the frame processing unit 3, respectively. The serial interface of the input/output interface unit B, C, D of the digital signal processing LSI2a is electrically connected to the serial interface of the input/output interface unit F, J, N of the digital signal processing LSIs 2b to 2d, respectively. The selection units 7a to 7c of the digital signal processing LSIs 2b to 2d switch and electrically connect the parallel side interface of the input/output interface unit E, I, M and one of the signal processing units 6b to 6d and the parallel side interface of the input/output interface unit F, J, N, respectively, according to the selected modulation scheme.
The operation of the optical transceiver is explained below. When QPSK (bit rate 100Gbit/s) is selected as the low-efficiency modulation scheme and an optical transceiver corresponding to the QPSK modulation scheme is applied to the optical transceivers 1a to 1d, as shown in fig. 6, the selection units 7a to 7c of the digital signal processing LSIs 2b to 2d electrically connect the parallel side interface of the input/output interface unit E, I, M and the signal processing units 6b to 6d, respectively. Thus, the optical signals transmitted or received by the optical transceivers 1a to 1d are subjected to signal interaction with the ports P1 to P4 of the frame processing unit 3 via the digital signal processing LSIs 2a to 2 d. In this way, the optical transceivers connect the opposing optical transceivers via four media, and transmit or receive signal light with a bit rate of 100Gbit/s × 4 to 400 Gbit/s.
On the other hand, when 64QAM (bit rate 400Gbit/s) is selected as the high-efficiency modulation scheme and an optical transceiver corresponding to the 64QAM modulation scheme is applied to the optical transceivers 1a to 1d, as shown in fig. 7, the selection units 7a to 7c of the digital signal processing LSIs 2b to 2d electrically connect the parallel-side interface of the input/output interface unit E, I, M and the parallel-side interface of the input/output interface unit F, J, N, respectively. Thus, the optical signal transmitted or received by the optical transceiver 1a is subjected to 1-channel 100Gbit/s signal interaction with the port P1 of the frame processing unit 3 via the digital signal processing LSI2a, and 2-4-channel 100Gbit/s signal interaction with the ports P2 to P4 of the frame processing unit 3 via the digital signal processing LSI2a and the input/output interface units of the digital signal processing LSIs 2b to 2d, respectively. Thus, the optical transceivers connect the opposing optical transceivers through one medium, and transmit or receive signal light having a bit rate of 400 Gbit/s.
The present invention is not limited to the configuration having two or four digital signal processing LSIs described in embodiments 1 and 2. The present invention is applicable to an optical transceiver having n digital signal processing LSIs each having a signal processing section capable of switching between modulation and demodulation of a low-efficiency modulation scheme and modulation and demodulation of a high-efficiency modulation scheme capable of transmitting or receiving signal light at a bit rate n times (n is an integer of 2 or more) the low-efficiency modulation scheme. In this case, each of the n digital signal processing LSIs includes a selection unit for switching and electrically connecting the parallel side interface of one input/output interface unit and one of the parallel side interfaces of the signal processing unit and the other input/output interface unit in accordance with the selected modulation scheme. The serial interface of the 1 st input/output interface section of the 1 st digital signal processing LSI is electrically connected to the 1 st port of the frame processing section. The serial side interfaces of the 1 st input/output interface section of the 2 nd to nth digital signal processing LSIs are electrically connected to the 2 nd to nth ports of the frame processing section, respectively. The serial side interface of the 2 nd to nth input/output interface units of the 1 st digital signal processing LSI is electrically connected to any one of the serial side interfaces of the input/output interface units of the 2 nd to nth digital signal processing LSI. The selection unit electrically connects the parallel side interface of the 1 st input/output interface unit and the signal processing unit when the low-efficiency modulation scheme is selected, and electrically connects the parallel side interface of the 1 st input/output interface unit and the parallel side interface of the input/output interface unit electrically connected to the input/output interface unit of the 1 st digital signal processing LSI among the 2 nd to nth input/output interface units when the high-efficiency modulation scheme is selected by switching between them. This can provide the same effects as in embodiments 1 and 2.
Fig. 8 is a diagram showing an optical transceiver according to embodiment 3 of the present invention. The signal processing unit 6a of the digital signal processing LSI2a is provided with a Bit Error Rate (BER) determination unit 10 that measures the bit error rate (ビット erroneous り rate) of the signal light transmitted through the medium and received by the optical transceiver 1a and determines whether or not the expected error rate is exceeded. Further, a control unit 11 that transmits or receives a control signal to or from the BER determination unit 10 and a display unit 12 connected to the control unit 11 are provided outside the optical transceiver. The controller 11 or the display 12 may be incorporated in the optical transceiver.
When starting transmission or reception of an optical signal, a user of the optical transceiver applies the optical transceivers 1a and 1b (e.g., the optical transceiver corresponding to 16QAM) corresponding to a higher-speed modulation scheme. The optical transceiver transmits or receives 200Gbit/s optical signals using one medium according to the user's instruction. The BER determination unit 10 evaluates the transmission quality of the 200Gbit/s optical signal, and the result is displayed on the display unit 12. When the communication quality does not meet a predetermined standard (BER exceeds a predetermined error rate) with reference to the display of the display unit 12, the user stops transmission or reception of the optical signal and applies two optical transceivers 1a and 1b (e.g., optical transceivers corresponding to QPSK) corresponding to the lower efficiency modulation scheme. And, the optical transceiver transmits or receives 100Gbit/s optical signals using two media according to the user's instruction.
By providing the BER determination unit 10 in the signal processing unit 6a of the digital signal processing LSI2a in this manner, the user of the optical transceiver can easily select an optimal modulation scheme in advance according to the transmission quality of the optical signal. Further, when the optical transceivers 1a and 1b adopt an adaptive optical transceiver capable of selecting a modulation scheme corresponding to the selected modulation scheme, the optical transceiver automatically selects an appropriate modulation scheme in accordance with the bit error rate (transmission quality) of the signal light transmitted through the medium, and thus the operation cost can be reduced.
Fig. 9 and 10 are diagrams showing an optical transceiver according to embodiment 4 of the present invention. In embodiment 1, the selector 7 is provided only in the digital signal processing LSI2 a. In contrast, in the present embodiment, the selection units 7d and 7e having the same configuration are provided on both the digital signal processing LSIs 2a and 2b, respectively.
The selection units 7d and 7e can perform the following two operations.
Action 1: the parallel side interface of the two input/output interface units is electrically connected to the signal processing unit.
And action 2: the parallel side interfaces of the two input/output interface units are electrically connected to each other.
When the optical transceiver is used for 100Gbit/s × 2 wavelength transmission application based on the QPSK modulation scheme, as shown in fig. 9, both the selection units 7d and 7e of the digital signal processing LSIs 2a and 2b execute "action 1". On the other hand, when the optical transceiver is used for a 200Gbit/s × 1 wavelength transmission application based on the 16QAM modulation scheme, as shown in fig. 10, the selector 7d of the digital signal processing LSI2a performs "action 1", and the selector 7e of the digital signal processing LSI2b performs "action 2". The selector 7d of the digital signal processing LSI2a fixedly executes only action 1 and does not execute action 2. Thus, the digital signal processing LSIs 2a, 2b can have the same configuration.
Conventionally, development of a system LSI requires a large amount of cost. Therefore, the system LSI is mass-produced with as few varieties as possible to achieve reduction in unit price. In the optical transceiver of the present embodiment, the digital signal processing LSIs 2a and 2b having the same configuration can be used, and thus the number of types of digital signal processing LSIs is not increased unexpectedly. As a result, the cost of the digital signal processing LSI or the optical transceiver can be further reduced.
Description of the reference symbols
1a to 1d optical transceivers; 2a to 2d digital signal processing LSIs; a 3-frame processing unit; 6a to 6d signal processing units; 7. 7a to 7e selection units; 10 bit error rate determination part; an A-P input/output interface part; P1-P4 ports.
Claims (5)
1. A digital signal processing apparatus, characterized in that the digital signal processing apparatus has:
a 1 st digital signal processing unit having a 1 st signal processing unit, a 1 st input/output interface unit, and a 2 nd input/output interface unit; and
a 2 nd digital signal processing unit having a 2 nd signal processing unit, a 3 rd input/output interface unit, a 4 th input/output interface unit, and a selection unit,
the 1 st and 2 nd signal processing units can selectively switch between modulation and demodulation of a low-efficiency modulation scheme and modulation and demodulation of a high-efficiency modulation scheme capable of transmitting or receiving signal light at a bit rate multiple of the low-efficiency modulation scheme to perform digital signal processing,
the 1 st input/output interface section, the 2 nd input/output interface section, the 3 rd input/output interface section, and the 4 th input/output interface section mutually convert a serial signal and a parallel signal,
the 1 st input/output interface unit and the 2 nd input/output interface unit are electrically connected to the 1 st signal processing unit,
the serial side interface of the 2 nd input/output interface unit is electrically connected with the serial side interface of the 4 th input/output interface unit,
the selection unit electrically connects the parallel side interface of the 3 rd input/output interface unit and the 2 nd signal processing unit when the low-efficiency modulation scheme is selected, and electrically connects the parallel side interface of the 3 rd input/output interface unit and the parallel side interface of the 4 th input/output interface unit when the high-efficiency modulation scheme is selected.
2. The digital signal processing device of claim 1,
the 1 st input/output interface section, the 2 nd input/output interface section, the 3 rd input/output interface section, and the 4 th input/output interface section each have: a serial/parallel converter that converts a serial signal into a parallel signal; and a parallel/serial converter converting the parallel signal into a serial signal,
the serial/parallel converter and the parallel/serial converter of the 1 st input/output interface unit and the serial/parallel converter and the parallel/serial converter of the 2 nd input/output interface unit are electrically connected to the 1 st signal processing unit,
a serial side interface of the serial/parallel converter of the 2 nd I/O interface unit is electrically connected to a serial side interface of the parallel/serial converter of the 4 th I/O interface unit,
a serial side interface of the parallel/serial converter of the 2 nd I/O interface part is electrically connected to a serial side interface of the serial/parallel converter of the 4 th I/O interface part,
the selection unit electrically connects the parallel side interfaces of the serial/parallel converter and the parallel/serial converter of the 3 rd input/output interface unit and the 2 nd signal processing unit when the low-efficiency modulation scheme is selected, electrically connects the parallel side interface of the serial/parallel converter of the 3 rd input/output interface unit and the parallel side interface of the parallel/serial converter of the 4 th input/output interface unit when the high-efficiency modulation scheme is selected, and electrically connects the parallel side interface of the parallel/serial converter of the 3 rd input/output interface unit and the parallel side interface of the serial/parallel converter of the 4 th input/output interface unit.
3. The digital signal processing apparatus according to claim 1 or 2,
the low-efficiency modulation scheme is a QPSK modulation scheme, and the high-efficiency modulation scheme is a 16QAM modulation scheme capable of transmitting or receiving signal light at a bit rate 2 times as high as the low-efficiency modulation scheme.
4. The digital signal processing apparatus according to claim 1 or 2,
the 1 st signal processing unit includes an error rate determination unit that measures an error rate of the signal light received by the optical transceiver and determines whether or not a required error rate is exceeded.
5. An optical transceiver, characterized in that the optical transceiver has:
a frame processing unit having a 1 st port and a 2 nd port;
a 1 st digital signal processing unit and a 2 nd digital signal processing unit which perform digital signal processing by inputting a signal from the frame processing unit or which output a signal subjected to digital signal processing to the frame processing unit; and
a 1 st optical transceiver for receiving signal light, converting the signal light into an electrical signal, and outputting the electrical signal to the 1 st digital signal processing unit, or converting the electrical signal input from the 1 st digital signal processing unit into signal light and transmitting the signal light,
a 2 nd optical transceiver for receiving signal light, converting the signal light into an electrical signal, and outputting the electrical signal to the 2 nd digital signal processing unit, or converting the electrical signal input from the 2 nd digital signal processing unit into signal light and transmitting the signal light,
the 1 st digital signal processing part comprises a 1 st signal processing part, a 1 st input/output interface part and a 2 nd input/output interface part,
the 2 nd digital signal processing part comprises a 2 nd signal processing part, a 3 rd input/output interface part, a 4 th input/output interface part and a selection part,
the 1 st and 2 nd signal processing units can selectively switch between modulation and demodulation of a low-efficiency modulation scheme and modulation and demodulation of a high-efficiency modulation scheme capable of transmitting or receiving signal light at a bit rate multiple of the low-efficiency modulation scheme to perform digital signal processing,
the 1 st input/output interface unit, the 2 nd input/output interface unit, the 3 rd input/output interface unit and the 4 th input/output interface unit mutually convert a serial signal and a parallel signal,
the 1 st input/output interface unit and the 2 nd input/output interface unit are electrically connected to the 1 st signal processing unit,
the serial side interfaces of the 1 st I/O interface and the 3 rd I/O interface are electrically connected to the 1 st port and the 2 nd port of the frame processing unit, respectively,
the serial side interface of the 2 nd input/output interface unit is electrically connected with the serial side interface of the 4 th input/output interface unit,
the selection unit electrically connects the parallel side interface of the 3 rd input/output interface unit and the 2 nd signal processing unit when the low-efficiency modulation scheme is selected, and electrically connects the parallel side interface of the 3 rd input/output interface unit and the parallel side interface of the 4 th input/output interface unit when the high-efficiency modulation scheme is selected.
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| JP2015183091A JP6011699B1 (en) | 2015-09-16 | 2015-09-16 | Digital signal processing apparatus and optical transceiver |
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| PCT/JP2016/076016 WO2017047430A1 (en) | 2015-09-16 | 2016-09-05 | Digital signal processing device and optical transceiver |
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| US11362754B1 (en) | 2021-03-04 | 2022-06-14 | Cisco Technology, Inc. | Adaptive inline modulation tuning for optical interfaces |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299640A (en) * | 2007-05-01 | 2008-11-05 | 夏普株式会社 | Data transmitting device, data receiving device, data receiving method, and data transmitting and receiving system |
| CN102098105A (en) * | 2011-01-06 | 2011-06-15 | 中兴通讯股份有限公司 | Self-adaptively modulated optical fiber communication method and system |
| CN102577177A (en) * | 2009-09-29 | 2012-07-11 | 三菱电机株式会社 | Multilevel modulated light transmitting/receiving apparatus and multilevel modulated light transmitting/receiving method |
| CN103516371A (en) * | 2013-09-18 | 2014-01-15 | 清华大学 | Configurable wireless transmitter |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9319143B2 (en) * | 2006-10-13 | 2016-04-19 | Menara Networks, Inc. | 40G/100G/200G/400G pluggable optical transceivers with advanced functionality |
| JP2010245809A (en) * | 2009-04-06 | 2010-10-28 | Kddi Corp | Power-saved optical transmitter-receiver |
| US8639116B2 (en) * | 2010-12-17 | 2014-01-28 | Ron Hui | Digital subcarrier optical network utilizing digital subcarrier cross-connects with increased energy efficiency |
| US9031406B2 (en) * | 2010-12-17 | 2015-05-12 | University Of Kansas | Digital subcarrier cross-connect switching |
| WO2013012015A1 (en) * | 2011-07-19 | 2013-01-24 | 日本電信電話株式会社 | Multi-flow optical transceiver, multi-flow optical transponder and multi-flow optical node |
| US9337934B1 (en) * | 2012-11-29 | 2016-05-10 | Clariphy Communications, Inc. | Coherent transceiver architecture |
| CN103166743B (en) * | 2013-01-31 | 2016-02-03 | 中国科学院空间科学与应用研究中心 | A kind of baseband digital signal coded modulation integral system |
| JP6198585B2 (en) * | 2013-11-21 | 2017-09-20 | 株式会社日立製作所 | Power-saving polarization multiplexed optical transceiver |
| US9337993B1 (en) * | 2013-12-27 | 2016-05-10 | Clariphy Communications, Inc. | Timing recovery in a high speed link |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299640A (en) * | 2007-05-01 | 2008-11-05 | 夏普株式会社 | Data transmitting device, data receiving device, data receiving method, and data transmitting and receiving system |
| CN102577177A (en) * | 2009-09-29 | 2012-07-11 | 三菱电机株式会社 | Multilevel modulated light transmitting/receiving apparatus and multilevel modulated light transmitting/receiving method |
| CN102098105A (en) * | 2011-01-06 | 2011-06-15 | 中兴通讯股份有限公司 | Self-adaptively modulated optical fiber communication method and system |
| CN103516371A (en) * | 2013-09-18 | 2014-01-15 | 清华大学 | Configurable wireless transmitter |
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| CN107852246A (en) | 2018-03-27 |
| CA2987565C (en) | 2019-01-15 |
| JP2017059989A (en) | 2017-03-23 |
| US10122465B2 (en) | 2018-11-06 |
| CA2987565A1 (en) | 2017-03-23 |
| WO2017047430A1 (en) | 2017-03-23 |
| JP6011699B1 (en) | 2016-10-19 |
| EP3319246A4 (en) | 2019-04-10 |
| EP3319246B1 (en) | 2019-11-20 |
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| EP3319246A1 (en) | 2018-05-09 |
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